Catalyst system

ABSTRACT

A catalyst system comprising a metallocene, a cocatalyst, a support material and optionally a further organometallic compound is described. The catalyst system can advantageously be used for the polymerization of olefins. Here, the use of aluminoxanes such as methylaluminoxane (MAO) as cocatalyst is dispensed with and a high catalyst activity and good polymer morphology are nevertheless achieved.

The present invention describes a catalyst system comprising ametallocene, a cocatalyst, a support material and optionally a furtherorganometallic compound. The catalyst system can advantageously be usedfor the polymerization of olefins. Here, the use of aluminoxanes such asmethylaluminoxane (MAO) as cocatalyst is dispensed with and a highcatalyst activity and good polymer morphology are nevertheless achieved.

The role of cationic complexes in Ziegler-Natta polymerization usingmetallocenes is generally recognized (H. H. Brintzinger, D. Fischer, R.Mülhaupt, R. Rieger, R. Waymouth, Angew, Chem. 1995, 107, 1255-1283).

MAO has hitherto been the most effective cocatalyst but has thedisadvantage of having to be used in a large excess, which leads to ahigh undesirable aluminum content in the polymer. The preparation ofcationic alkyl complexes opens the way to MAO-free catalysts having acomparable activity, with the cocatalyst being able to be used in analmost stoichiometric amount.

The synthesis of “cation-like” metallocene polymerization catalysts isdescribed in J. Am. Chem. Soc. 1991, 113, 3623. A process for preparingsalts of the formula LMX⁺ XA⁻ according to the above-described principleis disclosed in EP-A-0 520 732.

EP-A-0 558 158 describes zwitterionic catalyst systems which areprepared from dialkyl-metallocene compounds and salts of the formula[R₃NH]⁺ [B(C₆H₅)₄]⁻. The reaction of such a salt with, for example,Cp₂ZrMe₃ results in protolysis with elimination of methane to form amethyl-zirconocene cation as an intermediate. This reacts viaC-H-activation to give the zwitterion Cp₂Zr⁺-(m-C₆H₄)-BPh₃ ⁻. In this,the Zr atom is covalently bound to a carbon atom of the phenyl ring andis stabilized by agostic hydrogen bonds.

U.S. Pat. No. 5,384,299 describes zwitterionic catalyst systems preparedby protolysis from dialkyl-metallocene compounds and salts of theformula [R₃NH]⁺ [B(C₆F₅)₄]⁻. C-H Activation as subsequent reaction doesnot occur here.

EP-A-0 426 637 utilizes a process in which the Lewis-acid CPh₃ ⁺ cationis used for abstraction of the methyl group from the metal center.B(C₆F₅)₄- likewise functions as weakly coordinating anion.

Industrial use of metallocene catalysts requires the catalyst system tobe made heterogeneous so as to ensure an appropriate morphology of theresulting polymer. The application of cationic metallocene catalystsbased on the abovementioned borate anions to a support is described inWO 91/09882. Here, the catalyst system is formed by application of adialkyl-metallocene compound and a Bronsted-acid, quaternary ammoniumcompound having a noncoordinating anion, e.g.tetrakispentafluorophenylborate, to an inorganic support. The supportmaterial is modified beforehand by means of a trialkylaluminum compound.

A disadvantage of this method of application to a support is that only asmall part of the metallocene used is immobilized by physisorbtion onthe support material. When the catalyst system is metered into thereactor, the metallocene can easily become detached from the supportsurface. This leads to a partly homogeneous polymerization which resultsin an unsatisfactory polymer morphology. WO96/04319 describes a catalystsystem in which the cocatalyst is covalently bound to the supportmaterial. However, this catalyst system has a low polymerizationactivity and, in addition, the high sensitivity of the supportedcationic metallocene catalysts can lead to problems during introductioninto the polymerization system.

It would therefore be desirable to develop a catalyst system which caneither be activated before introduction into the reactor or be activatedonly in the polymerization autoclave.

It is an object of the present invention to provide a catalyst systemwhich avoids the disadvantages of the prior art and neverthelessguarantees high polymerization activities and a good polymer morphology.A further object is to develop a process for preparing this catalystsystem which makes it possible for the catalysts system to be activatedeither before introduction into the polymerization autoclave or only inthe polymerization autoclave itself.

We have found that these objects are achieved by a supported catalystsystem and a process for preparing it. The present invention furtherprovides for the use of the catalyst system of the present invention inthe preparation of polyolefins, and also provides a correspondingpolymerization process.

The catalyst system of the present invention comprises

A) at least one metallocene,

B) at least one Lewis base of the formula IM¹R³R⁴R⁵  (I)where

-   R³, R⁴, R⁵ are identical or different and are each a hydrogen atom    or a C₁-C₂₀-alkyl, C₁-C₂₀-haloalkyl, C₆-C₄₀-aryl, C₆-C₄₀-haloaryl,    C₇-C₄₀-alkylaryl or C₇-C₄₀-arylalkyl group or two or all three of    the radicals R³, R⁴ and R⁵ may be joined to one another via C₂-C₂₀    units,-   M¹ is an element of main group V of the Periodic Table of the    Elements, in particular nitrogen or phosphorus

C) at least one support

D) and at least one organoboron or organoaluminum compound which is madeup of units of the formula II[(R⁶)-X-M²(R⁸)-X-(R⁷)]_(k)  (II)where

-   R⁶, R⁷ are identical or different and are each a hydrogen atom, a    halogen atom, a boron-free C₁-C₄₀ group such as C₁-C₂₀-alkyl,    C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₂₀-haloaryl,    C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl,    C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl or an Si(R⁹)₃ group,-   where R⁹ is a boron-free C₁-C₄₀ group such as C₁-C₂₀-alkyl,    C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₂₀-haloaryl,    C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl,    C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl,-   R⁸ can be identical to or different from R⁶ and R⁷ and is a hydrogen    atom, a halogen atom, a C₁-C₄₀ group such as C₁-C₂₀-alkyl,    C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₂₀-haloaryl,    C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl,    C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl or an OSi(R⁹)₃ group,-   X may be identical or different and are each an element of group IV,    V or VIa of the Periodic Table of the Elements or an NH group.-   M² is an element of group IIIa of the Periodic Table of the Elements    and-   k is a natural number from 1 to 100,    and is covalently bound to the support.

The compounds of the formula (II) can be in the form of monomers or inthe form of linear, cyclic or cage-like oligomers. The index k is theresult of Lewis acid-base interactions of the chemical compound of theformula (II) to form dimers, trimers or higher oligomers.

Particular preference is also given to compounds in which M² is aluminumor boron.

Preferred compounds of the formula (I) are triethylamine,triisoproplamine, triisobutylamine, tri(n-butyl)amine,N,N-dimethylaniline, N,N-diethylaniline, N,N-2,4,6-pentamethylaniline,dicyclohexylamine, pyridine, pyrazine, triphenylphosphine,tri(methylphenyl)phosphine, tri(dimethylphenyl)phosphine.

Preferred cocatalytically active chemical compounds of the formula (II)are compounds in which X is an oxygen atom or an NH group and theradicals R⁶ and R⁷ are each a boron-free C₁-C₄₀-hydrocarbon radicalwhich may be halogenated, preferably perhalogenated, by halogen such asfluorine, chlorine, bromine or iodine, in particular a halogenated,especially perhalogenated, C₁-C₃₀-alkyl group such as trifluoromethyl,pentachloroethyl, heptafluoroisopropyl or monofluoroisobutyl or ahalogenated C₆-C₃₀-aryl group such as pentafluorophenyl,2,4,6-trifluorophenyl, heptachloronaphthyl, heptafluoronaphthyl,heptafluorotolyl, 3,5-bis(trifluoromethyl)phenyl,2,4,6-tris(trifluoromethyl)phenyl, nonafluorobiphenyl or4-(trifluoromethyl)phenyl. Likewise preferred as R⁶ and R⁷ are radicalssuch as phenyl, naphthyl, anisyl, methyl, ethyl, isopropyl, butyl,tolyl, biphenyl or 2,3-dimethylphenyl. Particularly preferred radicalsR⁶ and R⁷ are pentafluorophenyl, phenyl, biphenyl, bisphenylmethylene,3,5-bis(trifluoromethyl)phenyl, 4-(trifluoromethyl)phenyl,nonafluorobiphenyl, bis(pentafluorophenyl)methylene and 4-methylphenyl.

R⁸ is particularly preferably a boron-free C₁-C₄₀-hydrocarbon radicalwhich may be halogenated, preferably perhalogenated, by halogen such asfluorine, chlorine, bromine or iodine, in particular a halogenated,especially perhalogenated, C₁-C₃₀-alkyl group such as trifluoromethyl,pentachloroethyl, heptafluoroisopropyl or monofluoroisobutyl or ahalogenated C₆-C₃₀-aryl group such as pentafluorophenyl,2,4,6-trifluorophenyl, heptachloronaphthyl, heptafluoronaphthyl,heptafluorotolyl, 3,5-bis(trifluoromethyl)phenyl,2,4,6-tris(trifluoromethyl)phenyl, nonafluorobiphenyl or4-(trifluoromethyl)phenyl. Likewise preferred as R⁸ are radicals such asphenyl, naphthyl, anisyl, methyl, ethyl, isopropyl, butyl, tolyl,biphenyl or 2,3-dimethylphenyl. Particularly preferred radicals R⁸ aremethyl, ethyl, isopropyl, butyl, pentafluorophenyl, phenyl, biphenyl,bisphenylmethylene, 3,5-bis(trifluoromethyl)phenyl,4-(trifluoromethyl)phenyl, nonafluorobiphenyl,bis(pentafluorophenyl)methylene and 4-methylphenyl.

Very particularly preferred cocatalytically active chemical compounds ofthe formula (II) are ones in which X is oxygen, sulfur or an NH groupand M² is aluminum or boron.

Nonrestrictive examples to illustrative formula II (may also beunfluorinated) are:

The support components of the catalyst system of the present inventioncan be any organic or inorganic, inert solid, in particular a poroussupport such as talc, inorganic oxides and finely divided polymerpowders (e.g. polyolefins).

Suitable inorganic oxides are oxides of elements of groups 2, 3, 4, 5,13, 14, 15 and 16 of the Periodix Table of the Elements. Examples ofoxides preferred as supports include silicon dioxide, aluminum oxide andalso mixed oxides of the two elements and corresponding oxide mixtures.Other inorganic oxides which can be used alone or in combination withthe abovementioned preferred oxidic supports are, for example, MgO,ZrO₂, TiO₂ or B₂O₃, to name only a few.

The support materials used have a specific surface area in the rangefrom 10 to 1000 m²/g, a pore volume in the range from 0.1 to 5 ml/g anda mean particle size of from 1 to 500 μm. Preference is given tosupports having a specific surface area in the range from 50 to 500 μm,a pore volume in the range from 0.5 to 3.5 ml/g and a mean particle sizein the range from 5 to 350 μm. Particular preference is given tosupports having a specific surface area in the range from 200 to 400m²/g, a pore volume in the range from 0.8 to 3.0 ml/g and a meanparticle size of from 10 to 200 μm.

If the support material used naturally has a low moisture content orresidual solvent content, dehydration or drying before use can beomitted. If this is not the case, for example when using silica gel assupport material, dehydration or drying is advisable. Thermaldehydration or drying of the support material can be carried out underreduced pressure with simultaneous inert gas blanketing (e.g. nitrogen).The drying temperature is in the range from 100 to 1000° C., preferablyfrom 200 to 800° C. The parameter pressure is not critical in this case.The duration of the drying process can be from 1 to 24 hours. Shorter orlonger drying times are possible provided that equilibrium with thehydroxyl groups on the support surface can be established under thechosen conditions, which normally takes from 4 to 8 hours.

Dehydration or drying of the support material can also be carried out bychemical means, by reacting the adsorbed water and the hydroxyl groupson the surface with suitable passivating agents. The reaction with thepassivating reagent can convert all or some of the hydroxyl groups in aform which leads to no adverse interaction with the catalytically activecenters. Suitable passivating agents are, for example, silicon halidesand silanes, e.g. silicon tetrachloride, chlorotrimethylsilane,dimethylaminotrichlorosilane, or organometallic compounds of aluminum,boron and magnesium, for example trimethylaluminum, triethylaluminum,triisobutylaluminum, triethylborane, dibutylmagnesium. Chemicaldehydration or passivation of the support material is carried out, forexample, by reacting a suspension of the support material in a suitablesolvent with the passivating reagent in pure form or as a solution in asuitable solvent in the absence of air and moisture. Suitable solventsare, for example, aliphatic or aromatic hydrocarbons such as pentane,hexane, heptane, toluene or xylene. Passivation is carried out at from25° C. to 120° C., preferably from 50° C. to 70° C. Higher and lowertemperatures are possible. The reaction time is in the range from 30minutes to 20 hours, preferably from 1 to 5 hours. After chemicaldehydration is complete, the support material is isolated by filtrationunder inert conditions, washed one or more times with suitable inertsolvents as have been described above and subsequently dried in a streamof inert gas or under reduced pressure.

Organic support materials such as finely divided polyolefin powders(e.g. polyethylene, polypropylene or polystyrene) can also be used andshould likewise be freed of adhering moisture, solvent residues or otherimpurities by appropriate purification and drying operations before use.

The chemical compounds of the formula (I) used according to the presentinvention can be employed together with an organometallic transitionmetal compound as catalyst system. Organometallic transition metalcompounds used can be, for example, metallocene compounds. These may be,for example, bridged or unbridged bisyclopentadienyl complexes as aredescribed, for example, in EP-A-0 129 368, EP-A-0 561 479, EP-A-0 545304 and EP-A-0 576 970, monocyclopentadienyl complexes such as bridgedamidocyclopentadienyl complexes described, for example, in EP-A-0 416815, multinuclear cyclopentadienyl complexes as described, for example,in EP-A-0 632 063, π-ligand-substituted tetrahydroentalenes asdescribed, for example, in EP-A-0 659 758 or π-ligand-substitutedtetrahydroindenes as described, for example, in EP-A-0 661 300. It isalso possible to use organometallic compounds in which the complexingligand contains no cyclopentadienyl ligand. Examples are diaminecomplexes of transition groups III and IV of the Periodic Table of theElements, as are described, for example, in D. H. McConville, et al,Macromolecules, 1996, 29, 5241, and D. H. McConville, et al., J. Am.Chem. Soc., 1996, 118, 10008. It is also possible to use diiminecomplexes of transition group VIII of the Periodic Table of the Elements(e.g. Ni²⁺ or Pd²⁺ complexes), as are described in Brookhart et al., J.Am. Chem. Soc. 1995, 117, 6414, and Brookhart et al., J. Am. Chem. Soc.,1996, 118, 267. 2,6-Bis(imino)pyridyl complexes of transition group VIIIof the Periodic Table of the Elements (e.g. Co²⁺ or Fe²⁺ complexes), asare described in Brookhart et al, J. Am. Chem. Soc. 1998, 120, 4049, andGibson et al, Chem. Commun. 1998, 849, can also be used. Furthermore, itis possible to use metallocene compounds whose complexing ligandcontains heterocycles. Examples of such compounds are described in WO98/222486.

Preferred metallocene compounds are unbridged or bridged compounds ofthe formula (III),

where

-   M³ is a metal of transition group III, IV, V or VI of the Periodic    Table of the Elements, in particular Ti, Zr or Hf,-   R¹⁰ are identical or different and are each a hydrogen atom or    Si(R¹²)₃, where R¹² are identical or different and are each a    hydrogen atom or a C₁-C₄₀ group, preferably C₁-C₂₀-alkyl,    C₁-C₁₀-fluoroalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₁₀-fluoroaryl,    C₆-C₁₀-aryloxy, C₂-C₁₀-alkenyl, C₇-C₄₀-arylalkyl, C₇-C₄₀-alkylaryl    or C₈-C₄₀-arylalkenyl, or R¹⁰ is a C₁-C₃₀ group, preferably    C₁-C₂₅-alkyl such as methyl, ethyl, tert-butyl, cyclohexyl or octyl,    C₂-C₂₅-alkenyl, C₃-C₁₅-alkylalkenyl, C₆-C₂₄-aryl, C₅-C₂₄-heteroaryl,    C₇-C₃₀-arylalkyl, C₇-C₃₀-alkylaryl, fluorinated C₁-C₂₅-alkyl,    fluorinated C₆-C₂₄-aryl, fluorinated C₇-C₃₀-arylalkyl, fluorinated    C₇-C₃₀-alkylaryl or C₁-C₁₂-alkoxy, or two or more radicals R¹⁰ may    be joined to one another in such a way that the radicals R¹⁰ and the    atoms of the cyclopentadienyl ring which connect them form a C₄-C₂₄    ring system which may in turn be substituted,-   R¹¹ are identical or different and are each a hydrogen atom or    Si(R¹²)₃, where R¹² are identical or different and are each a    hydrogen atom or a C₁-C₄₀ group, preferably C₁-C₂₀-alkyl,    C₁-C₁₀-fluoroalkyl, C₁-C₁₀-alkoxy, C₆-C₁₄-aryl, C₆-C₁₀-fluoroaryl,    C₆-C₁₀-aryloxy, C₂-C₁₀-alkenyl, C₇-C₄₀-arylalkyl, C₇-C₄₀-alkylaryl    or C₈-C₄₀-arylalkenyl, or R¹¹ is a C₁-C₃₀ group, preferably    C₁-C₂₅-alkyl such as methyl, ethyl, tert-butyl, cyclohexyl or octyl,    C₂-C₂₅-alkenyl, C₃-C₁₅-alkylalkenyl, C₆-C₂₄-aryl, C₅-C₂₄-heteroaryl,    C₅-C₂₄-alkylheteroaryl, C₇-C₃₀-arylalkyl, C₇-C₃₀-alkylaryl,    fluorinated C₁-C₂₅-alkyl, fluorinated C₆-C₂₄-aryl, fluorinated    C₇-C₃₀-arylalkyl, fluorinated C₇-C₃₀-alkylaryl or C₁-C₁₂-alkoxy, or    two or more radicals R¹¹ may be joined to one another in such a way    that the radicals R¹¹ and the atoms of the cyclopentadienyl ring    which connect them form a C₄-C₂₄ ring system which may in turn be    substituted,    is 5 when v=0, and 1 is 4 when v=1,    is 5 when v=0, and m is 4 when v=1,-   L¹ may be identical or different and are each a hydrogen atom, a    C₁-C₁₀-hydrocarbon group such as C₁-C₁₀-alkyl or C₆-C₁₀-aryl, a    halogen atom, or OR¹⁶, SR¹⁶, OSi(R¹⁶)₃, Si(R¹⁶)₃, P((R¹⁶)₂ or    N(R¹⁶)₂, where R¹⁶ is a halogen atom, a C₁-C₁₀-alkyl group, a    halogenated C₁-C₁₀-alkyl group, a C₆-C₂₀-aryl group or a halogenated    C₆-C₂₀-aryl group, or L¹ is a toluenesulfonyl, trifluoroacetyl,    trifluoroacetoxyl, trifluoromethanesulfonyl,    nonafluorobutanesulfonyl or 2,2,2-trifluoroethanesulfonyl group,-   o is an integer from 1 to 4, preferably 2,-   Z is a bridging structural element between the two cyclopentadienyl    rings and v is 0 or 1.

Examples of Z are M⁴R¹³R¹⁴ groups, where M⁴ is carbon, silicon,germanium or tin and R¹³ and R¹⁴ are identical or different and are eacha C₁-C₂₀ group such as C₁-C₁₀-alkyl, C₆-C₁₄-aryl or trimethylsilyl. Z ispreferably CH₂, CH₂CH₂, CH(CH₃)CH₂, CH(C₄H₉)C(CH₃)₂, C(CH₃)₂, (CH₃)₂Si,(CH₃)₂Ge, (CH₃)₂Sn, (C₆H₅)₂Si, (C₆H₅)(CH₃)Si, (C₆H₅)₂Ge, (C₆H₅)₂Sn,(CH₂)₄Si, CH₂Si(CH₃)₂, o-C₆H₄ or 2,2′-(C₆H₄)₂. It is also possible for Ztogether with one or more radicals R¹⁰ and/or R¹¹ to form a monocyclicor polycyclic ring system.

Preference is given to chiral bridged metallocene compounds of theformula (III), in particular those in which v is 1 and one or bothcyclopentadienyl rings are substituted so that they form an indenylring. The indenyl ring is preferably substituted, in particular in the 2position, 4 position, 2,4,5 positions, 2,4,6 positions, 2,4,7 positionsor 2,4,5,6 positions, by C₁-C₂₀ groups such as C₁-C₁₀-alkyl orC₆-C₂₀-aryl, where two or more substituents of the indenyl ring may alsotogether form a ring system.

Chiral bridged metallocene compounds of the formula (III) can be used aspure racemic or pure meso compounds. However it is also possible to usemixtures of a racemic compound and a meso compound.

Examples of metallocene compounds are:

-   dimethylsilanediylbis(indenyl)zirconium dichloride-   dimethylsilanediylbis(4-naphthyl-indenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-benzo-indenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-indenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-(1-naphthyl)-indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(2-naphthyl)-indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-t-butyl-indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-isopropyl-indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-ethyl-indenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-α-acenaphthindenyl)zirconium    dichloride-   dimethylsilanediylbis(2,4-dimethylinedenyl)zirconium dichloride-   dimethylsilanediylbis(2-ethyl-indenyl)zirconium dichloride-   dimethylsilanediylbis(2-ethyl-4-ethylindenyl)zirconium dichloride-   dimethylsilanediylbis(2-ethyl-4-phenylinedenyl)zirconium dichloride-   Dimethylsilandiybis(2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-4,6 diisopropylinedenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4,5 diisopropylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2,4,5-trimethylindenyl)zirconium dichloride-   dimethylsilanediylbis(2,5,6-trimethylindenyl)zirconium dichloride-   dimethylsilanediylbis(2,4,7-trimethylindenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-5-isobutylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-5-t-butylindenyl)zirconium dichloride-   methyl(phenyl)silanediylbis(2-methyl-4-phenylindenyl)zirconium    dichloride-   methyl(phenyl)silanediylbis(2-methyl-4,6-diisopropylindenyl)    zirconium dichloride-   methyl(phenyl)silanediylbis(2-methyl-4-isopropylindenyl)zirconium    dichloride-   methyl(phenyl)silanediylbis(2-methyl-4,5-benzoindenyl)zirconium    dichloride-   methyl(phenyl)silanediylbis(2-methyl-4,5-(methylbenzo)indenyl)    zirconium dichloride-   methyl(phenyl)silanediylbis(2-methyl-4,5-(tetramethylbenzo)indenyl)zirconium    dichloride-   methyl(phenyl)silanediylbis(2-methyl-4-α-acenaphthindenyl)zirconium    dichloride-   methyl(phenyl)silanediylbis(2-methylindenyl)zirconium dichloride-   methyl(phenyl)silanediylbis(2-methyl-5-isobutylindenyl)zirconium    dichloride-   1,2-ethanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride-   1,4-butanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride-   1,2-ethanediylbis(2-methyl-4,6-diisopropylindenyl)zirconium    dichloride-   1,4-butanediylbis(2-methyl-4-isopropylindenyl)zirconium dichloride-   1,4-butanediylbis(2-methyl-4,5-benzoindenyl)zirconium dichloride-   1,2-ethanediylbis(2-methyl-4,5-benzoindenyl)zirconium dichloride-   1,2-ethanediylbis(2,4,7-trimethylindenyl)zirconium dichloride-   1,2-ethanediylbis(2-methyl-indenyl)zirconium dichloride-   1,4-butanediylbis(2-methylindenyl)zirconium dichloride-   [4-(η⁵-cyclopentadienyl)-4,6,6-trimethyl-(η⁵-4,5-tetrahydropentalene)]dichlorozirconium-   [4-(η⁵-3′-trimethylsilylcyclopentadienyl)-4,6,6-trimethyl-(η⁵-4,5-tetrahydropentalene)]dichlorozirconium-   [4-(η⁵-3′-isopropylcyclopentadienyl)-4,6,6-trimethyl-(η⁵-4,5-tetrahydropentalene)]dichlorozirconium-   [4-(η⁵-cyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorotitanium-   [4-(η⁵-cyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorozirconium-   [4-(η⁵-cyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorohafnium-   [4-(η⁵-3′-tert-butylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorotitanium-   4-(η⁵-3′-isopropylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorotitanium-   4-(η⁵-3′-methylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorotitanium-   4-(η⁵-3′-trimethylsilylcyclopentadienyl)-2-trimethylsilyl-4,7,7-trimethyl-(η⁵-4,5,6,7-tetrahydroindenyl)]dichlorotitanium-   4-(η⁵-3′-(tert-butylcyclopentadienyl)-4,7,7-trimethyl-(η⁵-4,5,7,7-tetrahydroindenyl)]dichlorozirconium-   (tertbutylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilyldichlorotitanium-   (tertbutylamido)(tetramethyl-η⁵-cyclopentadienyl)-1,2-ethanediyldichlorotitanium-dichlorotitanium-   (methylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilyldichlorotitanium-   (methylamido)(tetramethyl-η⁵-cyclopentadienyl)-1,2-ethanediyldichorotitanium-   (tert-butylamido)(2,4-dimethyl-2,4-pentadien-1-yl)dimethylsilyldichlorotitanium-   bis(cyclopentadienyl)zirconium dichloride-   bis(n-butylcyclopentadienyl)zirconium dichloride-   bis(1,3-dimethylcyclopentadienyl)zirconium dichloride-   tetrachloro[1-[bis(η⁵-1H-inden-1-ylidene)methylsilyl]-3-η⁵-cyclopenta-2,4-dien-1-ylidene)-3-η⁵-9H-fluoren-9-ylidene)butane]dizirconium-   tetrachloro[2-[bis(η⁵-2-methyl-1H-inden-1-ylidene)methoxysilyl]-5-(η⁵-2,3,4,5-tetramethylcyclopenta-2,4-dien-1-ylidene)-5-(η⁵-9H-fluoren-9-ylidene)hexane]dizirconium-   tetrachloro[1-[bis(η⁵-1H-inden-1-ylidene)methylsilyl]-6-(η⁵-cyclopenta-2,4-dien-1-ylidene)-6-(η⁵-9H-fluoren-9-ylidene)-3-oxa-heptane]dizirconium-   dimethylsilanediylbis(2-methyl-4-(tert-butylphenylidenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4-trifluoromethylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4-methoxyphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4-trifluoromethylphenylindenyl)    zirconium dichloride-   dimethylsilanediylbis(2-ethyl-4-(4-methoxyphenylindenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4-tert-butylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-methyl-4-(4-methylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-methyl-4-(4-ethylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-methyl-4-(4-trifluoromethylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-methyl-4-(4-methoxyphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-ethyl-4-(4-tert-butylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-ethyl-4-(4-methylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-ethyl-4-(4-ethylphenylindenyl)zirconium    diethyl-   dimethylsilanediylbis(2-ethyl-4-(4-trifluoromethylphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-ethyl-4-(4-methoxyphenylindenyl)zirconium    dimethyl-   dimethylsilanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)    zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)    hafnium dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)titanium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-methylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-n-propylphenyl)indenyl)    zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-n-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-hexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-sec-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-phenyl)indenyl)zirconium dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-methylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-ethylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-n-propylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-n-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-hexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-pentylphenyl)indentyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-cyclohexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-sec-butylphenyl)indentyl)zirconium    dichloride-   dimethylsilanediylbis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-phenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-methylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-ethylphenyl)-indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-isopropylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-n-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-hexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-cyclohexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-sec-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-propyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-phenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-methylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-ethylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-n-propylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-isopropylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-n-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-hexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-cyclohexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-sec-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-n-butyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-phenyl)indenyl)zirconium dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-methylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-ethylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-n-propylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-isopropylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-n-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-hexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-cyclohexylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-sec-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-hexyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)zirconium    bis(dimethylamide)-   dimethylsilanediylbis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dibenzyl-   dimethylsilanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dimethyl-   dimethylgermanediylbis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylgermanediylbis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)hafnium    dichloride-   dimethylgermanediylbis(2-propyl-4-(4′-tert-butylphenyl)indenyl)titanium    dichloride-   dimethylgermanediylbis(2-methyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   ethylidenebis(2-ethyl-4-phenyl)indenyl)zirconium dichloride-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   ethylidenebis(2-n-propyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   ethylidenebis(2-n-butyl-4-(4′-tert-butylphenyl)indenyl)titanium    dichloride-   ethylidenebis(2-hexyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dibenzyl-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)hafnium    dibenzyl-   ethylidenebis(2-methyl-4-(4′-tert-butylphenyl)indenyl)titanium    dibenzyl-   ethylidenebis(2-methyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)hafnium    dimethyl-   ethylidenebis(2-n-propyl-4-phenyl)indenyl)titanium dimethyl-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    bis(dimethylamide)-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)hafnium    bis(dimethylamide)-   ethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)titanium    bis(dimethylamide)-   methylethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   methylethylidenebis(2-ethyl-4-(4′-tert-butylphenyl)indenyl)hafnium    dichloride-   phenylphosphinediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   phenylphosphinediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   phenylphosphinediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-ethylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-n-propylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-isopropylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-n-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-s-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-n-pentylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-n-hexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-cyclohexylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-trimethylsilylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-adamantylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)(2-methyl-4-(4′-tris(trifluoromethyl)methylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-ethyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5,6-di-hydro-4-azapentalene)(2-ethyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)(2-ethyl-4-(4′-tert-butylphenyl-tetrahydroindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)(2-n-butyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   Ethyliden(2-methyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-trimethylsilyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-tolyl-5-azapentalene)(2-n-propyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   Dimethylgermyldiyl(2-methyl-N-phenyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   Methylethyliden(2,5-dimethyl-4-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-di-iso-propyl-6-azapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)(2,6-dimethyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(6′-tert-butylnaphthylindenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)(2-methyl-4-(6′-tert-butylanthracenylindenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-phosphapentalen)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   diphenylsilanediyl(2-methyl-5-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   methylphenylsilanediyl(2-methyl-6-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   methylidene(2,5-dimethyl-4-thiapentalene)(2-methyl-4-(4-tert-butylphenylindenyl)zirconium    dichloride-   dimethylmethylidene(2,5-dimethyl-6-thiapentalene)(2-methyl-4-(4′-tert-butylphenylindenyl)zirconium    dichloride-   diphenylsilanediyl(2,5-dimethyl-4-oxapentalene)    (2-methyl-4-(4′-tert-butylphenylindenyl)zirconium dichloride-   diphenylsilanediyl(2,5-dimethyl-6-oxapentalene)    (2-methyl-4-(4′-tert-butylphenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)    (2-methylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene) (2-methylindenyl)    zirconium dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)    (indenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)    (indenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)    (indenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene) (indenyl)    zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene) (indenyl)    zirconium dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene) (indenyl)zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene) (2-methyl-4-phenyl    indenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene) (2-methyl-4-phenyl    indenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)    (2-methyl-4-phenylindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-4-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-5-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-N-phenyl-6-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-4-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-N-phenyl-6-azapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-thiapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-thiapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-thiapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-thiapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-thiapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-4-oxapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-5-oxapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2-methyl-6-oxapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-4-oxapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediyl(2,5-dimethyl-6-oxapentalene)    (2-methyl-4,5-benzoindenyl)zirconium dichloride-   dimethylsilanediylbis(2-methyl-4-azapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-5-azapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-6-azapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-N-phenyl-4-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-N-phenyl-5-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-N-phenyl-6-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-4-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-6-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-N-phenyl-4-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-N-phenyl-6-azapentalene)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-thiapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-5-thiapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-6-thiapentalene)zirconium dichloride-   dimethylsilanediylbis(2,5-dimethyl-4-thiapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-6-thiapentalene)zirconium    dichloride-   dimethylsilanediylbis(2-methyl-4-oxapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-5-oxapentalene)zirconium dichloride-   dimethylsilanediylbis(2-methyl-6-oxapentalene)zirconium dichloride-   dimethylsilanediylbis(2,5-dimethyl-4-oxapentalene)zirconium    dichloride-   dimethylsilanediylbis(2,5-dimethyl-6-oxapentalene)zirconium    dichloride

Further examples of metallocenes which can be used for the purposes ofthe present invention are metallocenes as listed above in which thezirconium fragment “zirconium dichloride” is replaced by

-   zirconium monochloride mono(2,4-di-tert-butylphenoxide)-   zirconium monochloride mono(2,6-di-tert-butylphenoxide)-   zirconium monochloride mono(3,5-di-tert-butylphenoxide)-   zirconium monochloride mono(2,6-di-sec-butylphenoxide)-   zirconium monochloride mono(2,4-di-methylphenoxide)-   zirconium monochloride mono(2,3-di-methylphenoxide)-   zirconium monochloride mono(2,5-di-methylphenoxide)-   zirconium monochloride mono(2,6-di-methylphenoxide)-   zirconium monochloride mono(3,4-di-methylphenoxide)-   zirconium monochloride mono(3,5-di-methylphenoxide)-   zirconium monochloride monophenoxide-   zirconium monochloride mono(2-methylphenoxide)-   zirconium monochloride mono(3-methylphenoxide)-   zirconium monochloride mono(4-methylphenoxide)-   zirconium monochloride mono(2-ethylphenoxide)-   zirconium monochloride mono(3-ethylphenoxide)-   zirconium monochloride mono(4-ethylphenoxide)-   zirconium monochloride mono(2-sec-butylphenoxide)-   zirconium monochloride mono(2-tert-butylphenoxide)-   zirconium monochloride mono(3-tert-butylphenoxide)-   zirconium monochloride mono(4-sec-butylphenoxide)-   zirconium monochloride mono(4-tert-butylphenoxide)-   zirconium monochloride mono(2-isopropyl-5-methylphenoxide)-   zirconium monochloride mono(4-isopropyl-3-methylphenoxide)-   zirconium monochloride mono(5-isopropyl-2-methylphenoxide)-   zirconium monochloride mono(5-isopropyl-3-methylphenoxide)-   zirconium monochloride mono(2,4-bis-(2-methyl-2-butyl)-phenoxide)-   zirconium monochloride mono(2,6-di-tert-butyl-4-methyl-phenoxide)-   zirconium monochloride mono(4-nonylphenoxide)-   zirconium monochloride mono(1-naphthoxide)-   zirconium monochloride mono(2-naphthoxide)-   zirconium monochloride mono(2-phenylphenoxide)-   zirconium monochloride mono(tert-butoxid)-   zirconium monochloride mono(N-methylanilide)-   zirconium monochloride mono(2-tert-butylanilide)-   zirconium monochloride mono(tert-butylamide)-   zirconium monochloride mono(diisopropylamide)-   zirconium monochloride monomethyl-   zirconium monochloride monobenzyl-   zirconium monochloride mononeopentyl.

Preference is also given to the corresponding dimethylzirconiumcompounds, the corresponding η⁴-butadienezirconium compounds and thecorresponding compounds having a 1,2-(1-methylethanediyl),1,2-(1,1-dimethylethanediyl) or 1,2-(1,2-dimethylethanediyl) bridge.

The catalyst system of the present invention can further comprise anorganometallic compound of the formula (IV)[M⁵R²⁰ _(p)]_(q)  (IV)where

-   -   M⁵ is an element of main group I, II or III of the Periodic        Table of the Elements, preferably lithium, magnesium or        aluminum, in particular aluminum,    -   R²⁰ are identical or different and are each a hydrogen atom, a        halogen atom or a C₁-C₄₀ group such as C₁-C₂₀-alkyl,        C₆-C₄₀-aryl, C₇-C₄₀-arylalkyl or C₇-C₄₀-alkylaryl,    -   p is an integer from 1 to 3 and    -   q is an integer from 1 to 4.

The organometallic compounds of the formula (IV) are likewise unchangedLewis acids.

Examples of preferred organometallic compounds of the formula (IV) aretrimethylaluminum, triethylaluminum, triisopropylaluminum,trihexylaluminum, trioctylaluminum, tri-n-butylaluminum,tri-n-propylaluminum, triisoprenylaluminum, dimethylaluminummonochloride, diethylaluminum monochloride, diisobutylaluminummonochloride, methylaluminum sesquichloride, ethylaluminumsesquichloride, dimethylaluminum hydride, diethylaluminum hydride,diisopropylaluminum hydride, dimethylaluminum trimethylsiloxide,dimethylaluminum triethylsiloxide, phenylalane, pentafluorophenylalane,o-tolylalane.

The catalyst system of the present invention is obtainable by reacting aLewis base of the formula (I) and an organoboron or organoaluminumcompound made up of units of the formula (II) with a support. This isfollowed by reaction with a solution or suspension of one or moremetallocene compounds of the formula (III) and optionally one or moreorganometallic compounds of the formula (IV).

The activation of the catalyst system can thereby be carried out eitherbefore its introduction into the reactor or else only in the reactoritself. The present invention also describes a process for preparingpolyolefins. The addition of a further chemical compound as additiveprior to the polymerization can be of additional advantage.

To prepare the catalyst system of the present invention, the supportmaterial is suspended in an organic solvent. Suitable solvents arearomatic or aliphatic solvents such as hexane, heptane, toluene orxylene or halogenated hydrocarbons such as methylene chloride orhalogenated aromatic hydrocarbons such as o-dichlorobenzene. The supportcan be pretreated beforehand with a compound of the formula (IV).Subsequently, one or more compounds of the formula (I) is/are added tothis suspension, with the reaction time being able to be from 1 minuteto 48 hours, preferably from 10 minutes to 2 hours. The product can beisolated from the reaction solution and subsequently resuspended, orelse the reaction solution can be reacted directly with acocatalytically active organoboron or organoaluminum compound of theformula (II). The reaction time here is from 1 minute to 48 hours,preferably from 10 minutes to 2 hours. To prepare the catalyst system ofthe present invention, one or more Lewis bases of the formula (I) can bereacted with one or more cocatalytically active organoboron ororganoaluminum compounds of the formula (II). Preference is given toreacting from 1 to 4 equivalents of a Lewis base of the formula (I) withone equivalent of a cocatalytically active compound. Particularpreference is given to reacting one equivalent of a Lewis base of theformula (I) with one equivalent of a cocatalytically active compound.The reaction product of this reaction is a metallocenium-formingcompound which fixed covalently to the support material. It willhereinafter be referred to as modified support material. The reactionmixture is subsequently filtered and the solid washed with one of theabovementioned solvents. The modified support material is then dried ina high vacuum. However, the addition of the individual components canalso be carried out in any other order.

The application of one or more metallocene compounds, preferably of theformula (III), and one or more organometallic compounds of the formula(IV) to the modified support material is preferably carried out bydissolving or suspending one or more metallocene compounds of theformula (III) in one of the above-described solvents and subsequentlyreacting it with one or more compounds of the formula (IV), which is/arepreferably likewise in dissolved or suspended form. The stoichiometricratio of metallocene compound of the formula (III) to organometalliccompound of the formula (IV) is from 100:1 to 10⁻⁴:1. The ratio ispreferably from 1:1 to 10⁻²:1. The modified support material can beplaced together with one of the abovementioned solvents either directlyin the polymerization reactor or in a reaction flask. This is followedby the addition of the mixture of a metallocene compound of the formula(III) and an organometallic compound of the formula (IV). However, it isalso possible for one or more metallocene compounds of the formula (III)to be added to the modified support material without prior addition ofan organometallic compound of the formula (IV).

The ratio of modified support to metallocene compound of the formula(III) is preferably from 10 g:1 μmol to 10⁻² g:1 μmol. Thestoichiometric ratio of metallocene compound of the formula (III) to thecocatalytically active chemical compound of the formula (II) is from100:1 to 10⁻⁴:1, preferably from 1:1 to 10⁻²:1.

The supported catalyst system can be used directly for polymerization.However, it is also possible for the solvent to be removed and the solidthen to be used in resuspended form for the polymerization. Theadvantage of this activation method is that it offers the option ofallowing the polymerization-active catalyst system to be formed only inthe reactor. This prevents partial decomposition of the air-sensitivecatalyst from occurring during its introduction into the reactor.

The present invention also describes a process for preparing an olefinpolymer in the presence of the catalyst system of the present invention.The polymerization can be either a homopolymerization or acopolymerisation.

Preference is given to polymerizing olefins of the formulaR—CH═CH—R^(β), where R and R^(β) are identical or different and are eacha hydrogen atom, a halogen atom, an alkoxy, hydroxy, hydroxyalkyl,aldehyde, carboxylic acid or carboxylic ester group or a saturated orunsaturated hydrocarbon radical having from 1 to 20 carbon atoms, inparticular from 1 to 10 carbon atoms, which may be substituted by analkoxy, hydroxy, hydroxyalkyl, aldehyde, carboxylic acid or carboxylicester group, or R^(α) and R^(β) together with the atoms connecting themform one or more rings. Examples of such olefins are 1-olefins such asethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene,styrene, cyclic olefins such as norbornene, vinylnorbornene,tetracyclododecene, ethylidenenorbornene, dienes such as 1,3-butadieneor 1,4-hexadiene, biscyclopentadiene or methyl methacrylate.

Particular preference is given to homopolymerizing propylene orethylene, copolymerizing ethylene with one or more C₃-C₂₀-1-olefins, inparticular propylene, and/or one or more C₄-C₂₀-dienes, in particular1,3-butadiene, or copolymerizing norbornene and ethylene.

The polymerization is preferably carried out at from −60 to 300° C.,particularly preferably from 30 to 250° C. The pressure is from 0.5 to2500 bar, preferably from 2 to 1500 bar. The polymerization can becarried out continuously or batchwise, in one or more stages, insolution, in suspension, in the gas phase or in a supercritical medium.

The supported catalyst system can either be formed directly in thepolymerization system or it can be isolated as a dry powder or as apowder still moist with solvent and then resuspended and metered as asuspension in an inert suspension medium into the polymerization system.

A prepolymerization can be carried out with the aid of the catalystsystem of the present invention. The prepolymerization is preferablycarried out using the (or one of the) olefin(s) used in thepolymerization.

To prepare olefin polymers having a broad molecular weight distribution,preference is given to using catalyst systems comprising two or moredifferent transition metal compounds, e.g. metallocenes.

To remove catalyst poisons present in the olefin, purification using analuminum alkyl, for example trimethylaluminum, triethylaluminum ortriisobutylaluminum, is advantageous. This purification can be carriedout either in the polymerization system itself or the olefin is broughtinto contact with the Al compound and subsequently separated off againprior to introduction into the polymerization system.

As molar mass regulator and/or to increase the activity, hydrogen isadded if necessary. The total pressure in the polymerization system isfrom 0.5 to 2500 bar, preferably from 2 to 1500 bar.

The catalyst system of the present invention is employed in aconcentration, based on the transition metal, of preferably from 10⁻³ to10⁻⁸ mol, more preferably from 10⁻⁴ to 10⁻⁷ mol, of transition metal perdm³ of solvent or per dm³ of reactor volume.

Suitable solvents for preparing both the supported chemical compoundaccording to the present invention and also the catalyst system of thepresent invention are aliphatic or aromatic solvents such as hexane ortoluene, ether solvents such as tetrahydrofuran or diethyl ether orhalogenated hydrocarbons such as methylene chloride or halogenatedaromatic hydrocarbons such as o-dichlorobenzene.

Before introduction of the catalyst system of the present invention orbefore activation of the catalyst system of the present invention in thepolymerization system, an alkylalumiunum compound such astrimethylaluminum, triethylaluminum, triisobutylaluminum,trioctylaluminum or isoprenylaluminum can additionally be introducedinto the reactor to make the polymerization system inert (for example toremove catalyst poisons present in the olefin). This is added to thepolymerization system in a concentration of from 200 to 0.001 mmol of Alper kg of reactor content. Preference is given to usingtriisobutylaluminum or triethylaluminum in a concentration of from 10 to0.01 mmol of Al per kg of reactor contents; in this way, a low Al/M¹molar ratio can be chosen in the synthesis of a supported catalystsystem.

In addition, an additive such as an antistatic can be used in theprocess of the present invention, e.g. for improving the particlemorphology of the polymer.

It is generally possible to use all antistatics which are suitable forpolymerization. Examples are salt mixtures of calcium salts of Medialanacid and chromium salts of N-stearylanthranilic acid as described inDE-A-3,543,360. Further suitable antistatics are, for example,C₁₂-C₂₂-fatty acid soaps of alkali metals or alkaline earth metals,salts of sulfonic esters, esters of polyethylene glycols with fattyacids, polyoxyethylene alkyl ethers, etc. An overview of antistatics isgiven in EP-A-0,107,127.

It is also possible to use a mixture of a metal salt of Medialan acid, ametal salt of anthranilic acid and a polyamine as antistatic, asdescribed in EP-A-0,636,636.

Commercially available products such as Stadis® 450 from DuPont, namelya mixture of toluene, isopropanol, dodecylbenzenesulfonic acid, apolyamine, a copolymer of 1-decene and SO₂ and also 1-decene, or ASA®-3from Shell and ARU5R® 163 from ICI can likewise be used.

The antistatic is preferably used as a solution; in the preferred caseof Stadis® 450, preference is given to using from 1 to 50% by weight ofthis solution, preferably from 5 to 25% by weight, based on the mass ofthe support catalyst used (support together with covalently boundmetallocenium-forming compound and one or more metallocene compounds,e.g. of the formula IV). However, the amount of antistatic required canvary within a wide range, depending on the type of antistatic used.

The following examples illustrate the invention.

General procedures: Preparation and handling of the compounds werecarried out in the absence of air and moisture under argon (Schlenktechnique). All solvents required were dried before use by boiling for anumber of hours over suitable desiccants and subsequent distillationunder argon. To characterize the compounds, samples were taken from theindividual reaction mixtures and dried in an oilpump vacuum.

EXAMPLE 1 Synthesis of Bis(pentafluorophenyloxy)methylalane (1)

5.2 ml of trimethylaluminum (2M in Exxol, 10.8 mmol) together with 40 mlof toluene are placed in a reaction vessel and cooled to −40° C. 4.0 g(21.6 mmol) of pentafluorophenol in 40 ml of toluene are added dropwiseto this solution over a period of 30 minutes. The mixture is stirred for15 minutes at −40° C. and the reaction solution is subsequently allowedto warm to room temperature. It is stirred for another one hour at roomtemperature. This results in a colorless solution (0.14 M based on Al)of bis(pentafluorophenyloxy)methylalane.

19F-NMR (C₆D₆): δ=−160.5 ppm (m, 4F,o-C₆F₅); −161.8 ppm (m, 2F, p-C₆F₅);−166.3 ppm (m, 4F, m-C₆F₅).

1H-NMR (C₆D₆): δ=−0.4 ppm (s, 3H, CH₃).

EXAMPLE 2 Synthesis of Bis(pentafluorophenyloxy)ethylalane (2)

5.0 ml of triethylaluminum (2.1 M in Varsol, 10.5 mmol) together with 40ml of toluene are placed in a reaction vessel and cooled to −40° C. 4.0g (21.0 mmol) of pentafluorophenol in 40 ml of toluene are addeddropwise to this solution over a period of 30 minutes. The mixture isstirred for 15 minutes at −40° C. and the reaction solution issubsequently allowed to warm to room temperature. It is stirred foranother one hour at room temperature. This results in a colorlesssolution (0.13 M based on Al) of bis(pentafluorophenyloxy)ethylalane.

19F-NMR (C₆D₆): δ=−160.9 ppm (m, 4F,o-C₆F₅); −162.1 ppm (m, 2F, p-C₆F₅);−167.3 ppm (m, 4F, m-C₆F₅)

1H-NMR (C₆D₆): δ=0.5 ppm (t, 3H, CH₃), 1.6 ppm (q, 2H, CH₂).

EXAMPLE 3 Synthesis of Bis(pentafluoroanilino)methylalane (3)

5.0 ml of trimethylaluminum (2.1 M in Exxol, 10.5 mmol) together with 40ml of toluene are placed in a reaction vessel and cooled to −40° C. 3.8g (21.0 mmol) of pentafluoroaniline in 40 ml of toluene are addeddropwise to this solution over a period of 30 minutes. The mixture isstirred for 15 minutes at −40° C. and the reaction solution issubsequently allowed to warm to room temperature. It is stirred foranother two hours at room temperature. This results in a yellowishsolution (0.13 M based on Al) of bis(pentafluoroanilino)methylalane.

19F-NMR (C₆D₆): δ=−162.9 ppm (m, 4F,o-C₆F₅); −164.1 ppm (m, 2F, p-C₆F₅);−171.3 ppm (m, 4F, m-C₆F₅)

1H-NMR (C₆D₆): δ=−0.4 ppm (t, 3H, CH₃), 5.6 ppm (s, 1H, NH).

EXAMPLE 4 Synthesis of Bis(bis(pentafluorophenyl)methoxy)methylalane (4)

5.0 ml of trimethylaluminum (2.1 M in Exxol, 10.5 mmol) together with 40ml of toluene are placed in a reaction vessel and cooled to −40° C. 7.6g (21.0 mmol) of bis(pentafluorophenyl) carbinol in 40 ml of toluene areadded dropwise to this solution over a period of 30 minutes. The mixtureis stirred for 15 minutes at −40° C. and the reaction solution issubsequently allowed to warm to room temperature. It is stirred foranother two hours at room temperature. This results in a yellowishsolution (0.13 M based on Al) ofbis(bis(pentafluorophenyl)methoxy)methylalane.

19F-NMR (C₆D₆): δ=−140.6 ppm (m, 4F, o-CH(C₆F₅)₂); −151.7 ppm (m, 2F,p-CH(C₆F₅)₂); −159.5 ppm (m, 4F, m-CH(C₆F₅)₂).

1H-NMR (C₆D₆): δ=6.2 ppm (s, 1H, CH).

EXAMPLE 5 Synthesis of Bis(3,5 Bis(trifluoromethyl)anilino)methylalane(5)

5.0 ml of trimethylaluminum (2.1 M in Exxol, 10.5 mmol) together with 40ml of toluene are placed in a reaction vessel and cooled to −40° C. 4.8g (21.0 mmol) of 3,5-bis(trifluoromethyl)aniline in 40 ml of toluene areadded dropwise to this solution over a period of 45 minutes. The mixtureis stirred for 15 minutes at −40° C. and the reaction solution issubsequently allowed to warm to room temperature. It is stirred foranother four hours at room temperature. The slightly turbid solution isfiltered through a G4 frit. This results in a clear yellowish solution(0.13 M based on Al) of bis(3,5-bis(trifluoromethyl)anilino)methylalane.

19F-NMR (C₆D₆): δ=−61.5 ppm (s, 12F, CF₃).

1H-NMR (C₆D₆): δ=5.5 ppm (s, 1H, NH), 6.3 ppm (s, 2H, Ar—H), 7.2 ppm (s,1H, Ar—H).

EXAMPLE 6 Synthesis of Bis(nonafluorobiphenyloxy)methylalane (6)

5.0 ml of trimethylaluminum (2.1 M in Exxol, 10.5 mmol) together with 40ml of toluene are placed in a reaction vessel and cooled to −40° C. 7.0g (21.0 mmol) of nonafluorobiphenyl-1-ol in 40 ml of toluene are addeddropwise to this solution over a period of 40 minutes. The mixture isstirred for 30 minutes at −40° C. and the reaction solution issubsequently allowed to warm to room temperature. It is stirred foranother one hour at room temperature. The slightly turbid solution isfiltered through a G4 frit. This results in a clear solution (0.13 Mbased on Al) of bis(nonafluorobiphenyloxy)methylalane.

19F-NMR (C₆D₆): δ=−134.0 ppm (m, 2F, 2,2′-F); −137.2 ppm (m, 2F, 3,3′-F); −154.6 ppm (m, 2F, 4, 4′-F); 157.0 ppm (m, 1F, 6-F); 161.7 (m,2F, 5, 5′-F).

1H-NMR (C₆D₆): δ=−0.3 ppm (s, 3H, CH₃).

General Description of the Application to a Support, the Preparation ofthe Catalyst and the Polymerization Procedure

A) Application to a support

14.0 g of SiO₂ (XPO 2107, from Grace, dried at 600° C. in a stream ofargon) together with 20 ml of toluene are placed in a reaction vessel,2.6 ml of N,N-dimethylaniline (20.80 mmol) are added dropwise and themixture is stirred at room temperature for two hours. 20.80 mmol of theappropriate cocatalyst, dissolved in 40 ml of toluene, are subsequentlyadded to 0° C. The suspension is allowed to warm to room temperature andis stirred for two hours at this temperature. The resulting bluishsuspension is filtered and the residue is washed with 50 ml of tolueneand then three times with 100 ml each time of n-pentane. The residue issubsequently dried in an oil pump vacuum. This gives the supportedcocatalyst system, which is weighed.

B) Preparation of the catalyst system

0.30 ml of trimethylaluminum (20% strength in Exxol, 700 μmol) is addedto a solution of 50 mg (80 μmol) ofdimethylsilanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride in50 ml of toluene, and the solution is stirred at RT for 1.5 hours. 960μmol/g of [SiO₂] of the cocatalyst prepared under A Application to asupport are subsequently added a little at a time. The mixture isstirred at room temperature for 30 minutes. The solvent is then removedin an oil pump vacuum. This gives a light-red free-flowing powder.

EXAMPLE 4 Polymerization

For introduction into the polymerization system, the appropriate amountof the supported catalyst system (6 μmil of metallocene) prepared underB is resuspended in 30 ml of Exxol.

In parallel thereto, a dry 16 dm³ reactor is flushed firstly withnitrogen and subsequently with propylene and charged with 10 dm³ ofliquid propene. 0.5 cm³ of a 20% strength triisobutylaluminum solutionin Varsol diluted with 30 cm³ of Exxol was then introduced into thereactor and the mixture was stirred at 30° C. for 15 minutes. Thecatalyst suspension was subsequently introduced into the reactor. Thereaction mixture was heated to the polymerization temperature of 60° C.(4° C./min) and the polymerization system was maintained at 60° C. for 1hour by means of cooling. The polymerization was stopped by venting theremaining propylene. The polymer is dried in a vacuum drying oven. Thereactor displaced no deposits on the interior wall or stirrer.

Polymerization Results

Supported catalyst system prepared from product from Example: 1 2 3 4 56 Amount of 50 50 50 50 50 50 metallocene [mg] Metallocene (mmol) 80 8080 80 80 80 Cocatalyst 960 960 960 960 960 960 (mmol) SiO₂ 14.0 14.014.0 14.0 14.0 14.0 weighed in [g] SiO₂ 19.95 19.28 19.46 23.60 21.4923.49 weighed out [g] Amount of supported 923 1074 1000 1074 893 997cocatalyst weighed in [mg] Amount of catalyst 975 1124 1050 1124 9431047 system weighed out [mg] Amount of catalyst 73 85 79 85 71 79 systemweighed in for polymerization [mg] [6 mmol of metallocene] Time (min) 6060 60 60 60 60 PP (kg) 0.622 0.480 0.484 0.589 0.281 0.589 Activity¹⁾166 128 129 157 75 157 ¹⁾Activity: kg of (PP)/g of metallocene × h

1. A catalyst system comprising: A) at least one metallocene, B) atleast one Lewis base of the formula I M¹R³R⁴R⁵ (I) wherein R³, R⁴ and R⁵are identical or different and are each a hydrogen atom, a halogen atom,a C₁-C₂₀-alkyl, C₁-C₂₀-haloalkyl, C_(6-C) ₄₀-aryl, C₆-C₄₀-haloaryl,C₇-C₄₀-alkylaryl or C₇-C₄₀-arylalkyl group or two or all three of theradicals R³, R⁴ and R⁵ may be joined to one another via C₂-C₂₀ units, M¹is an element of main group V of the Periodic Table of the Elements, C)at least one support, D) and at least one organoboron or organoaluminumcompound which is made up of units of the formula II[(R⁶)—X—M²(R⁸)—X—(R⁷)]_(k) (II) wherein R⁶ and R⁷ are identical ordifferent and are each a hydrogen atom, a halogen atom, a boron-freeC₁-C₄₀ group or an Si(R⁹)₃ group, where R⁹ is a boron-free C₁-C₄₀ group,R⁸ can be identical to or different from R⁶ and R⁷ and is a hydrogenatom, a halogen atom, a C₁-C₄₀ group or an OSi(R⁹)₃ group, X may beidentical or different and are each an element of group V or VIa of thePeriodic Table of the Elements or an NH group, M² is an element of groupIIIa of the Periodic Table of the Elements and k is a natural numberfrom 1 to 100, and is covalently bound to the support.
 2. The catalystsystem as claimed in claim 1, which further comprises an organometalliccompound of the formula (IV) [M⁵R²⁰ _(p)]_(q) (VI) wherein M⁵ is anelement of main group I, II or III of the Periodic Table of theElements, R²⁰ are identical or different and are each a hydrogen atom, ahalogen atom or a C₁-C₄₀ group, p is an integer from 1 to 3 and q is aninteger from 1 to
 4. 3. The catalyst system as claimed in claim 1,wherein M¹ is nitrogen or phosphorus.
 4. The catalyst system as claimedin claim 3, wherein R⁶ and R⁷ are identical or different and are each ahydrogen atom, a halogen atom, a C₁-C₂₀-alkyl, C₁-C₂₀-haloalkyl,C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₂₀-haloaryl, C₆-C₂₀-aryloxy,C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl, C₇-C₄₀-alkylaryl,C₇-C₄₀-haloalkylaryl or an Si(R⁹)₃ group, R⁹ is a C₁-C₂₀-alkyl,C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl, C₆-C₂₀-haloaryl,C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl,C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl, R⁸ is a hydrogen atom, a halogenatom, C₁-C₂₀-alkyl, C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl,C₆-C₂₀-haloaryl, C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl, C₇-C₄₀-haloarylalkyl,C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl or an OSi(R⁹)₃ group.
 5. Thecatalyst system as claimed in claim 1, wherein the compound of theformula II is selected from the group consisting of


6. The catalyst system as claimed in claim 4, wherein M² is boron. 7.The catalyst system as claimed in claim 1, wherein R⁸ is hydrogen atom,a halogen atom, a C₂-C₂₀-alkyl, C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy,C₆-C₂₀-aryl, C₆-C₂₀-haloaryl, C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl,C₇-C₄₀-haloarylalkyl, C₇-C₄₀-alkylaryl, C₇-C₄₀-haloalkylaryl or anOSi(R⁹)₃ group.
 8. The catalyst system as claimed in claim 5, whereinsaid at least one support is talc, an inorganic oxide or a polymerpowder.
 9. The catalyst system as claimed in claim 1, wherein said atleast one support is talc, polyolefin powder, MgO, ZrO₂, TiO₂, aluminumoxide or B₂O₃.
 10. The catalyst system as claimed in claim 2, wherein M⁵is lithium or aluminum and R²⁰ are identical or different in each areahydrogen atom, a halogen atom, a C₁-C₂₀-alkyl, C₆-C₄₀-aryl,C₇-C₄₀-arylalkyl or C₇-C₄₀-alkylaryl.
 11. The catalyst system as claimedin claim 5, which further comprises a trimethylaluminum,triethylaluminum, triisopropylaluminum, trihexylaluminum,tricotyluminum, tri-n-butylaluminum, tri-n-propylaluminum,triisoprenylaluminum, dimethylaluminum monochloride, diethylaluminummonochloride, diisobutylaluminum monochloride, methylaluminumsesquichloride, ethylaluminum sesquichloride, dimethyaluminum hydride,diethylaluminum hydride, diisopropylaluminum hydride, dimethylaluminumtrimethylsiloxide, dimethylaluminum triethylsiloxide, phenylalane,pentafluorophenylalane, or o-tolylalane.
 12. The catalyst system asclaimed in claim 1, wherein the at least one metallocene is of theformula III.

where M³ is a metal transition group III, IV, V or VI of the PeriodicTable of the Elements, R¹⁰ are identical or different and are each ahydrogen atom, Si(R¹²)₃ or a C₁-C₃₀ group, or two or more radicals R¹⁰may be joined to one another in such a way that the radicals R¹⁰ and theatoms of the cyclopentadienyl ring which connect them form a C₄-C₂₄ ringsystem which may in turn be substituted, R¹¹ are identical or differentand are each a hydrogen atom, Si(R¹²)₃, or a C₁-C₃₀ group, or two ormore radicals R¹¹ may be joined to one another in such a way that theradicals R¹¹ and the atoms of the cyclopentadienyl ring which connectthem form a C₄-C₂₄ ring system which may in turn be substituted, R¹² areidentical or different and are each a hydrogen atom or a C₁-C₄₀ group, lis 5 when v=0, and 1 is 4 when v=1, m is 5 when v=0, and m is 4 whenv=1, L¹ may be identical or different and are each a hydrogen atom, aC₁-C₁₀-hydrocarbon group, a halogen atom, or OR¹⁶, SR¹⁶, OSi(R¹⁶)₃,Si(R¹⁶)₃, P(R¹⁶)₂ or N(R¹⁶)₂, where R¹⁶ is a halogen atom, aC₁-C₁₀-alkyl group, a halogenated C₁-C₁₀-alkyl group, a C₆-C₂₀-arylgroup or a halogenated C₆-C₂₀-aryl group, or each L¹ is atoluenesulfonyl, trifluoroactyl, trifluoroacetoxyl,trifluoromethanesulfonyl, nonafluorobutanesulfonyl or2,2,2-trifluoroethanesulfonyl group, o is an integer from 1 to 4, Z is abridging structural element between the two cyclopentadienyl rings and vis 0 or
 1. 13. A process for preparing a polyolefin which comprisespolymerizing one or more olefins in the presence of the catalyst systemas claimed in claim
 1. 14. The catalyst system as claimed in claim 12,wherein M³ is Ti, Zr or Hf, R¹⁰ are identical or different and are eacha hydrogen atom, Si(R¹²)₃, C₁-C₂₅-alkyl, C₂-C₂₅-alkenyl,C₃-C₁₅-alkylalkenyl, C₆-C₂₄-aryl, C₅-C₂₄-heteroaryl, C₇-C₃₀-arylalkyl,C₇-C₃₀-alkylaryl, fluorinated C₁-C₂₅-alkyl, fluorinated C₆-C₂₄-aryl,fluorinated C₇-C₃₀-arylalkyl, fluorinated C₇-C₃₀-alkylaryl orC₁-C₁₂-alokoxy, or two or more radicals R¹⁰ may be joined to one anotherin such a way that the radicals R¹⁰ and the atoms of thecyclopentadienyl ring which connect them form a C₄-C₂₄ ring system whichmay in turn be substituted, R¹¹ are identical or different and are eacha hydrogen atom, Si(R¹²)₃, C₁-C₂₅-alkyl, C₂-C₂₅-alkenyl,C₃-C₁₅-alkylalkenyl, C₆-C₂₅-aryl, C₅-C₂₄-heteroaryl,C₅-C₂₄-alkylheteroaryl, C₇-C₃₀-arylalkyl, C₇-C₃₀-alkylaryl, fluorinatedC₁-C₂₅-alkyl, fluorinated C₆-C₂₄-aryl, fluorinated C₇-C₃₀-arylalkyl,fluorinated C₇-C₃₀-alkylaryl or C₁-C₁₂-alkoxy, or two or more radicalsR¹¹ may be joined to one another in such a way that the radicals R¹¹ andthe atoms of the cyclopentadienyl ring which connect them form a C₄-C₂₄ring system which may in turn be substituted, R¹² are identical ordifferent and are each a hydrogen atom, C₁-C₂₀-alkyl,C₁-C₁₀-fluoroalkyl, C₁-C₁₀-alkoxy, C₆-C₁₄-aryl, C₆-C₁₀-fluoroaryl,C₆-C₁₀-aryloxy, C₂-C₁₀-alkenyl, C₇-C₄₀-arylalkyl, C₇-C₄₀-aklylaryl orC₈-C₄₀-arylalkeny, or l is 5 when v=0, and 1 is 4 when v=1, m is 5 whenv=0, and m is 4 when v=1, L¹ may be identical or different and are eacha hydrogen atom, C₁-C₁₀-alkyl, C₆-C₁₀-aryl, a halogen atom, or OR¹⁶,SR¹⁶, OSi(R¹⁶)₃, Si(R¹⁶)₃, P(R¹⁶)₂ or N(R¹⁶)₂, where R¹⁶ is a halogenatom, a C₁-C₁₀-alkyl group, a halogenated C₁-C₁₀-alkyl group, aC₆-C₂₀-aryl group or a halogenated C₆-C₂₀-aryl group, or each L¹ is atoluenesulfonyl, trifluoroacetyl, trifluoroacetoxyl,trifluoromethanesulfonyl, nonafluorobutanesulfonyl, or2,2,2-trifluoroethanesulfonyl group, o is 2, Z is a bridging structuralelement between the two cyclopentadienyl rings and v is 0 or
 1. 15. Thecatalyst as claimed in claim 1, wherein the compound of the formula IIis